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Around one fifth of the world鈥檚 2000 largest public firms have committed to net zero targets in the coming years. Most are pledging to something called climate neutrality by a given date. But do these pledges actually make any difference in the flight against climate change? We here both sides of the argument with climate futurist Alex Steffen based in California, and Simon Glynn, the co-lead on Climate and Sustainability, at the UK management consultants, Oliver Wyman.

(Image: Cooling towers at a coal fueled power station. Credit: Getty Images).